I'm afraid I'm a bit disappointed. A function* whose plot looks like "hello world" would've been more interesting.
* Or rather an implicit equation of some sort.
I thought that it was going to be a fourier like overlay of the pixels making up hello world with some clever working to reduce the number of curves used but maximise the density of the in fill in the text.
Instead it's just a function that goes through the points relating to the ascii codes for the letters - (87,0), (111,1), etc..